The act of casting high profile stars in comic book roles is not a new practice. Going as far back as casting Gene Hackman as Lex Luthor, Marlon Brando as Jor-EL, Michael Keaton as Batman, and Jack Nicholson as The Joker, filmmakers have always looked to the big talents to make a maximum impact in superhero movies. Given its success, then, in recent times it's become commonplace for actors to attach themselves to projects within the Marvel Cinematic Universe. Directors have augmented the validity of their films with actors and actresses who are not only movie stars, but those who can seriously act. It creates a buzz for the movie, of course, getting fans and critic wondering how a certain actor will take on an established character. So take a look at the following list of huge stars who have yet to be cast in any MCU roles, all of which - I believe, at least - would bring a certain weight and brilliance to a whole host of comic book heroes and villains. Prepare to have all your MCU casting dreams come true. Once again, you're welcome Hollywood...